import	{	InjectionToken		}	from '@angular/core'

import	{	
			isErrorFree,
			assert,
			assertProperty
		}							from '@rcc/core'


export type RtcTransmissionMeta = ["rcc-wrt", string, string] // ["rcc-wrt", channel, key]

export function isRtcTransmissionMeta(x:unknown, throw_errors = false): x is RtcTransmissionMeta {

	if(!throw_errors) return isErrorFree( () => isRtcTransmissionMeta(x, true))

	assert(x instanceof Array,		"isRtcTransmissionMeta: must be an array.")
	assert(x[0] == 'rcc-rtc',		"isRtcTransmissionMeta: [0] must be 'rcc-rtc.")
	assert(typeof x[1] == 'string',	"isRtcTransmissionMeta: [1] must be string.")
	assert(typeof x[2] == 'string',	"isRtcTransmissionMeta: [2] must be string.")

}




export interface RtcTransmissionConfig {
	data			: any,
	signalServer	: string
	stunServers		: string[]
}



export function isRtcTransmissionConfig(x:unknown, throw_errors = false): x is RtcTransmissionConfig {

	if(!throw_errors) return isErrorFree( () => isRtcTransmissionConfig(x, true))
	
	assertProperty(x, 'data',					"isRtcTransmissionConfig: missing data.")
	assertProperty(x, 'signalServer',			"isRtcTransmissionConfig: missing url.")
	assert(typeof x.signalServer == 'string',	"isRtcTransmissionConfig: url must be a string.")
	assert(x.signalServer.match(/^wss:/),		"isRtcTransmissionConfig: url must start with 'wss:'.")

}




export const RTC_SIGNAL_SERVER 	= new InjectionToken<string>('url of the websocket server for webrtc ice negotiation')
export const RTC_STUN_SERVERS 	= new InjectionToken<string[]>('url of the stun servers for webrtc ice negotiation')